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CD solutions contain gold nanoparticles that are exceptionally tiny, typically falling within the size range of 1 to 100 nanometers. These nanoparticles showcase distinctive optical characteristics, such as a distinct red, pink, or purple hue, attributed to the interaction between light and particles at the nanoscale. As a result, colloidal gold or gold nanoparticles find application in binding with detection molecules to provide visual cues in numerous diagnostic tests, thereby boasting extensive utility in diagnostic healthcare. Colloidal gold finds diverse applications across various fields.

1. Biomedical Research: CD nanoparticles are used in a wide range of biomedical applications, such as drug delivery systems, targeted therapy, and diagnostic assays. Their small size and surface properties allow for efficient cellular uptake and targeted delivery of therapeutic agents.CD